One Thing I Need You to Do

Samuel felt slightly more rested when he woke up the next morning. He would tell that it was bright outside, but wasn't sure of what time it was because he couldn't check his phone. As he began to wake up more, one of the first things that he realized was that Lena was no longer in bed with him. In fact, he wasn't all that certain where exactly she was when he opened his eyes to look around and noticed that she didn't appear to be in her room any longer. Did that mean that she decided to get back to regular life after last night. 

Sitting up, he noticed though that the tray was still resting on the end table where he had left it the night which indicated that it was unlikely she had left the room as she would've taken it with her. Where was she then?